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Bug #732

Setting the file timestamp from EXIF data fails by 1 hour

Added by Ariel Garcia over 8 years ago. Updated almost 4 years ago.

Status:
Closed
Priority:
Normal
Assignee:
Category:
metadata
Target version:
Start date:
26 Sep 2010
Due date:
% Done:

100%

Estimated time:

Description

The following illustrates the problem:

$ exiv2 dsd_2180.jpg | grep timestamp
Image timestamp : 2010:08:23 18:39:56
$ exiv2 mv T dsd_2180.jpg
$ l dsd_2180.jpg
-r-------
1 ariel users 2332635 Aug 23 19:39 dsd_2180.jpg
$ exiv2 dsd_2180.jpg | grep timestamp
Image timestamp : 2010:08:23 18:39:56

Note the 1 hour shift between the file timestamp set (19:39) and the photo
timestamp in EXIF (18:36)!!

This has previously worked flawlessly.
System date is fine and updated with ntpdate.

$ cat /etc/timezone
Europe/Berlin

is also fine.


Files

DSD_1695.JPG (2.22 MB) DSD_1695.JPG Sample photo Ariel Garcia, 27 Sep 2010 15:07
exiv-out-DSD_1695.txt (11.8 KB) exiv-out-DSD_1695.txt exiv2 -pa output Ariel Garcia, 27 Sep 2010 15:07

History

#1

Updated by Ariel Garcia over 8 years ago

Versions:
exiv2 0.20-2
libexiv2-9 0.20-2

Debian testing packages, amd64

#3

Updated by Andreas Huggel over 8 years ago

Can you please provide the output of exiv2 -pa for such an image - I'd like to see all the timestamps. Or even better, provide an image to test with.

#4

Updated by Ariel Garcia over 8 years ago

Sure, attached a photo and the exiv2 -pa output.

I guess the problem is the
Exif.NikonWt.Timezone = UTC +01:00
field, when actually it was UTC+01:00/daylight-saving time (ie, +2).
However, running
exiv2 mv -T *.jpg
has previously always worked flawlessly for me, same camera, same settings.
Could it be that the way of handling the summertime changed?

Thanks!!

#5

Updated by Ariel Garcia about 4 years ago

Well, it has been some time now... but this issue seems to have been fixed meanwhile :)
Using Exiv 0.24-4 from Debian...

#6

Updated by Robin Mills about 4 years ago

  • Status changed from New to Assigned
  • Assignee set to Robin Mills
  • Target version set to 0.25

Gosh, this is an old issue. I was unaware that this was outstanding. I'll look at this later today.

#7

Updated by Robin Mills about 4 years ago

I'm going to leave this "Assigned" for a little while. To my knowledge, Exiv2 has no code TZ knowledge and relies on the host OS.

I've been using exiv2 -T to update my files for years while living in California. I've never noticed anything unusual about the dates on the file system - even with a Canon camera which was TimeZone/DST aware.

I now live in England and have an Nikon 5300 which is not only TZ/DST aware, it also has a GPS (and an option to set his clock using the GPS). DST starts here on March 29. If that transition is OK, I'll mark this as "Resolved".

I have run some tests, which have left me uncertain, and that's why I've decided to "wait and see in April in England"!

$ # Download fresh copy of test file
$ curl -O http://dev.exiv2.org/attachments/download/206/DSD_1695.JPG
  % Total    % Received % Xferd  Average Speed   Time    Time     Time  Current
                                 Dload  Upload   Total   Spent    Left  Speed
100 2274k    0 2274k    0     0  2018k      0 --:--:--  0:00:01 --:--:-- 2018k

$ Get the Metadata
$ exiv2 -g Date -g Time -g Zone DSD_1695.JPG 
Exif.Image.DateTime                          Ascii      20  2010:07:18 19:23:30
Exif.Photo.ExposureTime                      Rational    1  1/200 s
Exif.Photo.DateTimeOriginal                  Ascii      20  2010:07:18 19:23:30
Exif.Photo.DateTimeDigitized                 Ascii      20  2010:07:18 19:23:30
Exif.NikonWt.Timezone                        SShort      1  UTC +01:00
Exif.NikonWt.DateDisplayFormat               Byte        1  D/M/Y
Exif.Photo.SubSecTime                        Ascii       3  48
Exif.Photo.SubSecTimeOriginal                Ascii       3  48
Exif.Photo.SubSecTimeDigitized               Ascii       3  48

$ # File system thinks
$ stat DSD_1695.JPG 
16777220 50259960 -rw-r--r-- 1 rmills staff 0 2329314 "Mar 12 16:06:16 2015" "Mar 12 16:07:17 2015" "Mar 12 16:07:17 2015" "Mar 12 16:06:14 2015" 4096 4552 0 DSD_1695.JPG

580 $ # Update the stamps
581 $ exiv2 -T DSD_1695.JPG 
582 $ stat DSD_1695.JPG 
16777220 50259960 -rw-r--r-- 1 rmills staff 0 2329314 "Jul 18 19:23:30 2010" "Jul 18 19:23:30 2010" "Mar 12 16:09:12 2015" "Jul 18 19:23:30 2010" 4096 4552 0 DSD_1695.JPG

583 $ # switch to PDT (-7:00)
584 $ date
Thu 12 Mar 2015 09:09:54 PDT

$ # Download fresh copy of test file
$ curl -O http://dev.exiv2.org/attachments/download/206/DSD_1695.JPG
  % Total    % Received % Xferd  Average Speed   Time    Time     Time  Current
                                 Dload  Upload   Total   Spent    Left  Speed
100 2274k    0 2274k    0     0  2225k      0 --:--:--  0:00:01 --:--:-- 2225k

$ stat DSD_1695.JPG 
16777220 50259960 -rw-r--r-- 1 rmills staff 0 2329314 "Jul 18 11:23:30 2010" "Mar 12 09:10:11 2015" "Mar 12 09:10:11 2015" "Jul 18 11:23:30 2010" 4096 4552 0 DSD_1695.JPG

$ # Update the stamps
$ exiv2 -T DSD_1695.JPG 

$ stat DSD_1695.JPG 
16777220 50259960 -rw-r--r-- 1 rmills staff 0 2329314 "Jul 18 19:23:30 2010" "Jul 18 19:23:30 2010" "Mar 12 09:10:35 2015" "Jul 18 11:23:30 2010" 4096 4552 0 DSD_1695.JPG
$ 

#8

Updated by Robin Mills about 4 years ago

  • Status changed from Assigned to Resolved

I'm going to mark this "Resolved" as I don't believe there is a case to answer. I photos in the beautiful city of Oxford this evening and post-processed them when I got home. Here's what I see:

509 rmills@rmillsmbp:~/Pictures/2015/Oxford $ exiv2 -pa DSC_6440.jpg | grep -e 2015 -i -e gps 
Exif.Image.DateTime                          Ascii      20  2015:04:06 22:47:17
Exif.Photo.DateTimeOriginal                  Ascii      20  2015:04:06 18:46:34
Exif.Photo.DateTimeDigitized                 Ascii      20  2015:04:06 18:46:34
Xmp.xmp.ModifyDate                           XmpText    25  2015-04-06T22:47:17+01:00
510 rmills@rmillsmbp:~/Pictures/2015/Oxford $ ls -alt DSC_6440.jpg 
-rw-r--r--+ 1 rmills  staff  6841271  6 Apr 22:47 DSC_6440.jpg
511 rmills@rmillsmbp:~/Pictures/2015/Oxford $ exiv2 -T DSC_6440.jpg
512 rmills@rmillsmbp:~/Pictures/2015/Oxford $ ls -alt DSC_6440.jpg 
-rw-r--r--+ 1 rmills  staff  6841271  6 Apr 18:46 DSC_6440.jpg
513 rmills@rmillsmbp:~/Pictures/2015/Oxford $ date
Mon  6 Apr 2015 23:12:34 BST
514 rmills@rmillsmbp:~/Pictures/2015/Oxford $ 
Everything looks fine to me. The photo was taken at 18:46 and updated at 22:47. exiv2 -T restored the time stamp.
514 rmills@rmillsmbp:~/Pictures/2015/Oxford $ # ----- change to San Jose, CA ------------
515 rmills@rmillsmbp:~/Pictures/2015/Oxford $ date
Mon  6 Apr 2015 15:16:02 PDT
516 rmills@rmillsmbp:~/Pictures/2015/Oxford $ exiv2 -T DSC_6440.jpg 
517 rmills@rmillsmbp:~/Pictures/2015/Oxford $ ls -alt DSC_6440.jpg 
-rw-r--r--+ 1 rmills  staff  6841271  6 Apr  2015 DSC_6440.jpg
518 rmills@rmillsmbp:~/Pictures/2015/Oxford $ stat DSC_6440.jpg 
16777220 51470423 -rw-r--r-- 1 rmills staff 0 6841271 \
... "Apr  6 15:16:26 2015" "Apr  6 18:46:34 2015" \
... "Apr  6 15:16:20 2015" "Apr  6 10:46:34 2015" 4096 13368 0 DSC_6440.jpg
519 rmills@rmillsmbp:~/Pictures/2015/Oxford $ 
Curiously, ls -alt does not report the date correctly. How odd. However stat appears to be less nervous. Reset the machine's date/time prefs, exiv2 -T is effective in restoring the date.
519 rmills@rmillsmbp:~/Pictures/2015/Oxford $ # ------ change to BST (+00:00 + DayLightSaving)
520 rmills@rmillsmbp:~/Pictures/2015/Oxford $ ls -alt DSC_6440.jpg 
-rw-r--r--+ 1 rmills  staff  6841271  7 Apr  2015 DSC_6440.jpg
521 rmills@rmillsmbp:~/Pictures/2015/Oxford $ exiv2 -T DSC_6440.jpg 
522 rmills@rmillsmbp:~/Pictures/2015/Oxford $ ls -alt DSC_6440.jpg 
-rw-r--r--+ 1 rmills  staff  6841271  6 Apr 18:46 DSC_6440.jpg
523 rmills@rmillsmbp:~/Pictures/2015/Oxford $ 

#9

Updated by Robin Mills about 4 years ago

  • % Done changed from 0 to 100
#10

Updated by Andreas Huggel almost 4 years ago

  • Status changed from Resolved to Closed

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